Sawmill-dog.



No. 797,028. PATENTED AUG. 15, 1905. W. H. TROUT.

SAWMILL DOG.

APPLIOATIOE FILED AUG. 18,1904.

UNITED STATES PATENT OFFICE.

SAWMILL-DOG- Specification of Letters Patent.

Patented Aug. 15, 1905.

Application filed August 18, 1904. Serial No. 221,166.

To all whom it may concern.-

Be it known that 1, WILLIAM H. TROUT, a citizen of the Dominion of Canada, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Sawmill-Dogs, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

This invention relates more particularly to that class of dogs which have two sets of teeth movable in opposite directions and so connected with the operating-lever that both sets will be simultaneously and equally projected from the face of the knee in case of equal resistance to their movement or in case one set meets with an obstruction or greater resistance to its movement the other will be advanced alone or farther, so as to effectively engage with and hold a log or cant.

The main objects of the present invention are to provide for the separate adjustment and renewal of the individual teeth, to avoid as far as possible marring the lumber engaged and held by the dog, to facilitate the operation of the dog, and generally to improve the construction and operation ofdevices of this class.

It consists in certain novel features of construction and in the peculiar arrangement and combinations of parts, as hereinafter particularly described, and pointed out in the claims.

In the accompanying drawings like letters designate the same parts in the several figures.

Figure 1 is a side view of a sawmill-dog embodying the invention, the front side of the standard being removed and parts being broken away and shown in section. Fig.2 is a vertical section on the line 2 2, Fig. l; and Fig. 3 is a front view of the dog as seen from the right with reference to Fig. 1.

a designates a recessed standard adapted to be mounted upon and moved lengthwise of the head-block of a sawmill-carriage in the usual way. It is provided with guide-pins 6 6, passing transversely through it and held at the ends in sleeves c, which are threaded and adjustable endwise in the sides of the standard, as shown in Fig. 2. These sleeves are locked in place by jam-nuts (Z on their outer ends.

0 e are dog-plates formed with oblique slots ff, which fit loosely over and are adapted to ride upon rollers g g on the pins 6. The slots' in each plate are arranged in a direction opposite to that of the slots in the other plate, and the plates are arranged side by side in the recess in the standard between the inner ends them and without injuring the lumber.

of the sleeves e, which form adjustable bearings for their outer faces, avoiding the necessity of accurately fitting the dog-plates to the inner faces of the standard and affording means of adjustment to take up wear or play. Each plate is formed in the front side with sockets or holes, in which the teeth It are threaded. The teeth are formed of round or cylindrical bars cut off on a bevel or obliquely to their axes to form sharp points or edges. Two teeth can thus be economically made from a single bar of the required length by cutting it in two in a plane at the proper angle to its axis. The teeth are set in the plates 6 with their beveled or oblique faces parallel with the guide slots f, so that when they are thrust into a log or cant the round sides of the teeth opposite their beveled faces will bend the fibers of the wood without breaking The teeth are securely held in the dog-plates by set-screWs threaded in said plates in position to engage with longitudinal the threaded shanks of the teeth, as shown in Fig. 1. By turning the set-screws out sufliciently to clear the grooves with which they normally engage the teeth may be turned and adjusted in the dog-plates to bring their points in line with eachother or they may be readily removed to be sharpened when broken or dulled or to be replaced by new teeth.

The operating-lever j is pivoted directly to one of the dog-plates e and connected with the other by a link it. The lever is held up' and the teeth in retracted position, as shown in Fig. l, by a spring-catch Z engaging with an arm at on said lever.

Face-plates a a are attached to the front of the standard, on each side thereof, so that their inner edges will lie in close proximity to the teeth and receive any side thrust or strain to which they may be subjected and which might otherwise break or injure them or the dogplates 6.

By setting the teeth with their beveled or oblique faces instead of their axes parallel with the slots f in the dog-plates they may be made shorter than would otherwise be required and arranged to work or engage with a logor cantcloser to the head-block thanusual.

My improved dog operates as follows: To thrust the teeth into a log or cant'and secure it firmly to the standard, the lever jis turned downward, as indicated by dotted linesin Fig. l, the plate carryingthedownwardly-inclined teeth being carried downward by gravity as grooves in soon as the arm m is disengaged from the spring-catch Z until the teeth encounter the log or cant. When this occurs,the continued movement of the operating-lever downward, acting with equal power on both plates, will thrust both sets of teeth simultaneously and equally into the log or cant in case they meet with the same resistance. If, however, one set encounters an obstruction or greater resistance than the other set, the latter will be advanced alone to a sufiicient extent to securely hold the log or cant. The position of the teeth when both sets are projected equally from the standard to the fullest extent is indicated by dotted lines in Fig. 1. The teeth are retracted and the log or cant is released by turning the lever back into its upper position, as shown in Fig. 1.

Various changes in the details of construction and arrangement of parts may be made without departing from the principle and intended scope of the invention.

I claim- 1. In a sawmill-dog the combination with a standard, of a plate guided and movable obliq uely toward and from theface of the standard, and cylindrical teeth secured in said plate and having on one side plane oblique faces arranged parallel with the line of movcmentof the plate, substantially as described.

2. In a sawmill-dog the combination with a dog-plate having threaded sockets or holes, of adjustable cylindrical teeth threaded in said sockets or holes and having points formed by plane faces intersecting their cylindrical faces obliquely and set-screws threaded in said plate and engaging the shanks of the teeth,

' substantially as described.

8. In a sawmill-dog the combination witha standard, of a plate guided and movable obliquely toward and from the working face of the standard and having oblique threaded sockets or holes, cylindrical teeth threaded in said sockets or holes and having plane beveled or oblique faces forming their points and set parallel with the direction of movement of said plate, and set-screws threaded in said plate and engaging longitudinal grooves in the shanks of said teeth, substantially as described.

4. In a sawmill-dog the combination of a standard provided with transverse guide-pins, dog-plates provided with teeth and having obliquely and reversely arranged guide-slots through which said pins pass, and an operating-lever connected with said plates and arranged to move them in opposite directions, substantially as described.

5. Ina sawmill-dog the combination of a standard provided with transverse guide-pins, dog-plates provided with teeth and having obliquely and reversely arranged guide-slots through which said pins pass, and an operating-lever pivoted directly to one of said plates and connected with the other by a link, substantially as described.

6. In a sawmill-dog the combination of a recessed standard provided with transverse guide-pins held at the ends in sleeves threaded in the sides of the standard, and dog-plates provided with teeth and having reversely-arranged oblique guide-slots through which said pins pass, the inner ends of said sleeves forming bearings for the outer faces of said plates, substantially as described.

7. In a sawmill-dog the combination of a recessed standard provided with guide-pins passing transversely through it and held at the ends in sleeves which are threaded and adjustable endwise in the sides of the standard, rollers mounted on said pins, and dog-plates provided with teeth and having oblique guideslots adapted to work with said rollers, substantially as described.

8. In a sawmill-dog the combination of a recessed standard provided with guide-pins passing transversely through it, dogplates provided with teeth and having oblique guideslots through which said pins pass, and faceplates attached to the standard with their inner edges in position to guide and support the teeth against lateral displacement, substantially as described.

In witness whereof I hereto aflix my signature in presence of two Witnesses.

WILLIAM H. TROUT. 

